Region

AR

AR, Ar, or A&R may refer to:

Arts, entertainment, and media

Music

  • Artists and repertoire
  • AR (EP), the debut EP by Addison Rae

Periodicals

  • Absolute Return + Alpha, a hedge fund publication
  • The Adelaide Review, an Australian arts magazine
  • American Renaissance (magazine), a white nationalist magazine and website
  • Architectural Review, a British architectural journal
  • Armeerundschau, a magazine of the East German army

Other media

  • Ar, city on the fictional planet Gor
  • A.r. group, an avant-garde art group
  • Alternate reality (disambiguation), various fictional concepts

Business

  • Accounts receivable, abbreviated as AR or A/R
  • Acoustic Research, an American audio electronics manufacturer
  • Aerojet Rocketdyne, an American aerospace and defense manufacturer
  • Aerolíneas Argentinas (IATA airline code AR)
  • AtkinsRéalis, Canadian engineering company
  • Some Alfa Romeo car models, e.g. AR51
  • Toyota AR engine

Language

  • Ar, the Latin letter R when spelled out
  • Ar (cuneiform), a cuneiform combined sign
  • Arabic, by ISO 639-1 language code

Mathematics, science, and technology

Computing

  • ar (Unix), a Unix archive format and handling tool
  • Accelerated Reader, educational reading assessment software
  • Augmented reality, an application of virtual reality in the real world
  • Adobe Aero, an Adobe software

Biology and medicine

  • Androgen receptor, a nuclear hormone receptor
  • Aortic regurgitation, a heart valve disease
  • Autosomal recessive inheritance

Mathematics

  • ar-, a prefix of inverse hyperbolic functions
  • Autoregressive model, concerning random processes in statistics

Physics and chemistry

  • Aqua regia, a chemical mixture
  • Archimedes number in fluid dynamics
  • Argon, symbol Ar, a chemical element
  • Aryl group in organic chemistry
  • Relative atomic mass, symbolized as Ar

Other uses in science and technology

  • Anti-reflective, coating of lenses
  • Aspect ratio (aeronautics), of a wing

Military and weapons

  • A US Navy hull classification symbol: Repair ship (AR)
  • Armalite Rifle
    • AR-15–style rifle, rifles based on ArmaLite's AR-15
  • Army Reserve (Ireland), the land component of the Irish Reserve Defence Forces (RDF)

Places

  • Ar (city), in ancient Moab
  • Appenzell Ausserrhoden, Switzerland
  • Province of Arezzo, Italy, vehicle registration code
  • Argentina (ISO 3166-1 alpha-2 country code)
    • .ar, the country code Top Level Domain for Argentina
  • Arkansas, United States
  • Armstrong–Ringsted Community School District, Iowa, United States
  • Arunachal Pradesh, a state of India

Politics and ethics

  • Affirmative Repositioning, a political movement in Namibia
  • Animal rights, a philosophy
  • Animal rights movement, a social movement advocating for other animals
  • Antipodean Resistance, an Australian neo-Nazi group

Other uses

  • 🜇 or AR, a numismatic abbreviation for "silver"
  • Argent, the heraldic tincture of silver
  • Assistant referee (association football)
  • Auto rickshaw, a motorized three-wheeled vehicle common in South Asia
  • Avis de réception, postal advice or acknowledgement of receipt
Material taken from Wikipedia - the free encyclopedia